Key-operated switch is a common safety electrical device that controls the switching state of a circuit by using a key. This type of switch can be used in many different applications including machines, equipment and vehicles.

It not only ensures the safety of circuits and equipment, but also prevents unauthorized use and operation. Additionally, it protects workers and the public by preventing potential accidents or damage.

In addition, key-operated switches can also be used to keep important information confidential for companies or enterprises to ensure that their trade secrets will not be stolen by criminals.